Stanislas Oscar Seminario, aka SOS, is a young explorer, just back from Africa, visiting old friends: the Pescara's. But the father keeps receiving anonymous letters. And soon a mysterious murder is committed. SOS begins to investigate...
Paul Meurisse
Stanilas Octave Seminario aka 'SOS', détective
Micheline Francey
Muriel Pescara, the daughter
Gilbert Gil
Charles Pescara, the son
Pierre Renoir
Doctor Gérard Pescara, the father
Jean Tissier
Guillaume
Pierre-Louis
Paul Wantz
Junie Astor
Hélène Tassin, nurse
Jean Debucourt
Doctor Vermeulen
